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Percentage of conditioned responses (CRs) in mice aged 4 (n = 8), 12 (n = 8), and 18 (n = 8) months over five 90-paired trial sessions in the 250-msec delay eyeblink classical conditioning procedure as assessed by computer scoring of CRs. CRs are scored by the computer if electromyography activity in the orbicularis oculi muscle exceeds 5 standard deviations above baseline activity between 80 and 250 msec after the CS onset.
